How this is working? In java

Question

TreeMap t=new TreeMap();
t.put("5","6");
t.put("7","9");
SortedMap s=t.getKeys();
how sorted map can take return value while it's an interface..why explain someone?

Answer 1

Ohh my god! I was guessed that about this keyword😁😁😁😁

Answer 2

Congratulation as you just found out an example of polymorphism!

Interface was used to define the intended behaviour so there's nothing wrong here as the underlying object is a valid instance of class. 😉

Answer 3

thanks bro

Answer 4

this, it is used to declare a variable which is also declared in the function arguments. From this keyword, we can declare the fixed value of a variable which is inside in method and with similar name.
For eg.
void add(int a, int b) {
this.a = a;
this.b = b;
}
In above example, value which passed from arguments, declare values to the variable a and b inside the method add().

Answer 5

Nikki Singh sorry for inconvinience.

Answer 6

this helped me so much Bipin tatkare I will find out my problem and fix it.

Answer 7

Nikki Singh You're welcome! 😄